PYRETHRUM

This article appears in Volume V22, Page 689 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: PRE-PYR

PYRETHRUM . The pyrethrum or " feverfew " (nat. ord.

Compositae

COMPOSITAE

), now regarded as a section of the genus Chrysanthemum,

flowers

FLOWERS, ARTIFICIAL

in the early summer months, and is remark-able for its neat habit and the

great

GREAT

variety of character and colour which it presents. The type form is the Caucasian species P. roseum of botanists,

hardy

perennial, with finely cut leaves- a1Td large flower heads, having a ray of deep rosecoloured}1gurAtl florets surrounding the yellow centre or disk. They bloom during the months of May and June, as well as later, and ar iaghrvay's' Most welcome ornaments for the flower borders, and useftli Ur'htjtting for decorative purposes. There are now many I'eitc llent`varioties, both single and

double

-flowered, in cultivation' "
Tli pyrethrum grows best in soil of a loamy texture ; this should be well fiiariu''e'd' arid deeply trenched up before planting, and shotildll mulched iv the

spring

SPRING (from " to spring," " to leap or jump up," " burst out," O. Eng., springau, a common Teut. word, cf. Ger. springer, possibly allied to Gr. QnrFpxecOac, to move rapidly)

by a surface dressing of half-decayed manure,; i Tlae; plantn may be increased by division, the side shoots beitkg,tfl keq;4 ,eearl in.

spring

SPRING (from " to spring," " to leap or jump up," " burst out," O. Eng., springau, a common Teut. word, cf. Ger. springer, possibly allied to Gr. QnrFpxecOac, to move rapidly)

rather than in autumn, with a portion of ,roots attached. _ Plants disturbed in autumn frequently die cdhiiingi rhe, winter.. ''f`ney may be placed either in separate beds or i'n he}tiiizketl floWeV'fivYder as may be required. In beds they can be;snpplerwentect as the season passes on by the intermixture of later blg9fni sy,,bjects, such as gladioli. Slugs are often destructiv. t,9, 7jl}

yogi

YOGI

}gg s~h,9ots, but may be checked by a few sprinklings of sod or'Iitile Seeds Should be sown in spring in a cold

frame

FRAME

, and the P,u4i ""'T3larrts sliiiiiM be put out into beds when large enough, ane4n hould 86w+ev;.thd ,following May. New varieties are being coftgtatfl{ly rirytrodtugd t t p reader is referred to the catalogues of nurseiiyi i fait, atpe{l, Inds. The powdered root of P. roseum and other ~~ppeeies l's'hsed',ih the manufacture of

insect

INSECT

powders. P. parthenifHlilim'` var. dui'einn is the " golden-feather " of gardens, so much en4gk y't d ns>ran!,e9ging to flower-beds. P. parthenium, pellitory or if lvor>fe ," was formerly used in medicine. Its

double

-flowered form is well worth growing. P. uliginosum is the,"

great

GREAT

ox-eye daisy " that

flowers

FLOWERS, ARTIFICIAL

in September and October.

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